Thanks for the reply:
The blue screen always come when system start from hibernate state. No slow down is noticed.
Yes,Hotsopt shield is installed - I removed it now.
The computer is HP Pavilion dv6700 with Windows Vista with following details:
Windows NT Version 6.0 Build: 6000
Product (0x3): Windows Vista (TM) Home Premium
Edition: HomePremium
BuildString: 6000.16830.x86fre.vista_gdr.090302-1506
Flavor: Multiprocessor Free
Architecture: X86
LCID: 1033
All Windows updates with hardward drivers in addition to HP updates are applied.
Cordially,
Yassin